Convert ps1 to pnm Online: ps12pnm

You can use Tom's Editor to easily convert images from
ST-DEXL Pictures Set .PS1 to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

PS1

ST-DEXL Pictures Set is an image format with extension PS1.

PNM

PNM images are uncompressed 24 bit RGB images. Can cannot store Alpha channel. PNM images come in 2 types: binary and text. Especially popular on Linux.